Heat trasfer of flat oval cylinders in cross flow

Authors

  • Олександр Михайлович Терех National technical university of Ukraine "Kiev Polytechnic Institute" Pobedy ave, 37, Kiev, Ukraine 03056, Ukraine
  • Олександр Володимирович Семеняко National technical university of Ukraine "Kiev Polytechnic Institute" Pobedy ave, 37, Kiev, Ukraine 03056, Ukraine
  • Валерій Омелянович Туз National technical university of Ukraine "Kiev Polytechnic Institute" Pobedy ave, 37, Kiev, Ukraine 03056, Ukraine
  • Олександр Ігоревич Руденко National technical university of Ukraine "Kiev Polytechnic Institute" Pobedy ave, 37, Kiev, Ukraine 03056, Ukraine
  • Вадим Анатолійович Кондратюк National technical university of Ukraine "Kiev Polytechnic Institute" Pobedy ave, 37, Kiev, Ukraine 03056, Ukraine

DOI:

https://doi.org/10.15587/1729-4061.2013.14832

Keywords:

Нeat transfer, flow, cross, cylinder, tube, flat oval

Abstract

The article presents the results of the experimental study of convective heat transfer of single tubes of circular and flat oval profile in the range of variation of the relative elongation of the profile of the tubes  from 1 (round tube) to 2.625. The experiments were conducted in an open-type wind tunnel of rectangular cross section in the range of Reynolds number from 3000 to 25000. The degree of turbulence Tu of the incoming flow was (3.5-4)%, relative length of the cylinders . The method of electric heating of the studied surface was used at which the inner wall of the tube was provided with constant heat flow, and the regular method of the cooling of bodies of simple geometric shape of the I-st kind (for round tube d = 16 mm) was applied, at which the conditions  were provided.

The analysis of the data indicates that the heat exchange intensity of tubes of circular profile is higher than that of flat oval tubes at (16-35)% depending on the elongation of the profile. Its increase provides the reduction of heat transfer intensity. A generalized dependence was proposed to determine convective heat transfer coefficients of single flat oval tubes, which takes into account the effect on the heat transfer intensity of the relative elongation of the profile

Author Biographies

Олександр Михайлович Терех, National technical university of Ukraine "Kiev Polytechnic Institute" Pobedy ave, 37, Kiev, Ukraine 03056

PhD, Senior Researcher

Chair of nuclear power plants and engineering thermophysics

Олександр Володимирович Семеняко, National technical university of Ukraine "Kiev Polytechnic Institute" Pobedy ave, 37, Kiev, Ukraine 03056

Assistant

Chair of nuclear power plants and engineering thermophysics

Валерій Омелянович Туз, National technical university of Ukraine "Kiev Polytechnic Institute" Pobedy ave, 37, Kiev, Ukraine 03056

Doctor of sciences, professor

Chair of nuclear power plants and engineering thermophysics

Олександр Ігоревич Руденко, National technical university of Ukraine "Kiev Polytechnic Institute" Pobedy ave, 37, Kiev, Ukraine 03056

PhD, associate professor

Chair of economy and enterprise

Вадим Анатолійович Кондратюк, National technical university of Ukraine "Kiev Polytechnic Institute" Pobedy ave, 37, Kiev, Ukraine 03056

Post-graduate student

Chair of nuclear power plants and engineering thermophysics

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Published

2013-06-20

How to Cite

Терех, О. М., Семеняко, О. В., Туз, В. О., Руденко, О. І., & Кондратюк, В. А. (2013). Heat trasfer of flat oval cylinders in cross flow. Eastern-European Journal of Enterprise Technologies, 3(8(63), 30–34. https://doi.org/10.15587/1729-4061.2013.14832

Issue

Section

Energy-saving technologies and equipment